A251073 Number of tilings of a 9 X n rectangle using 3n trominoes of shape I.

1, 1, 1, 19, 57, 121, 783, 2861, 8133, 37160, 143419, 468816, 1876855, 7263468, 25496863, 97187247, 372086645, 1352780401, 5071962134, 19220628318, 71025008365, 265095817718, 997839772024, 3713274525679, 13851695644227, 51940567251136, 193830054345968

Offset: 0

Author

Alois P. Heinz, Nov 29 2014

Keywords

• nonn

Links

• Alois P. Heinz, Table of n, a(n) for n = 0..1000
• Alois P. Heinz, G.f. and Maple program for A251073
• Wikipedia, Tromino

Crossrefs

Column k=3 of A251072.

Cf. A236577.

Programs

Maple

# see link above.

Formula

G.f.: see link above.